Wireless receiving apparatus.



R. R. GOLDTHGRP.

WIRELESS RECEIVING APPARATUS.

APPLICATION FILED AUG.31, 1912.

Patented Mar. 24, 19m

2 sums-M21211.

WITNESSES j I. I a INVENTOR jm Roberz Goldt/zorp:

ATTORNEY "Q,

R.R GOLDTHORP. WIRELESS RECEIVING APPARATUS.

AIPLIOATION FILED AUG.81, 1912.

Patented M21224, 191i WITNESSES INVENTOR M/w 444w Haber? R Goidihorp:

ATTORN EY UNITED STATES. PATENT OFFICE.

ROBERT R. GOLDTHOBP, OF HARTFORD, CONNECTICUT.

. WIRELESS RECEIVING APPARATUS.

Specification of Letters latent.

Patented Mar.,24,1914-.'

Application filed August 31, 1912; Serial No. 717,993.-

To all whom it may concern Be it known that I, RoBnRr R. Gonn'rnonr, a citizen of the United States, and a resident of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Wireless Receiving Apparatus, of/which thefollow:

ing is a specification.

The object of this invention is to provide a set of receiving instruments for use with wireless transmission of intelligence which 1s simple, compact and self contained, and

the parts of which are readily accessible.

In the drawingsFigure 1 is aside view of my complete receiving set. Fig. 2 is a simple vertical section thereof. Fig. 3 is an end view. Fig. 4 is a cross sectional view; on the line a: in looking in the direction of the arrow (1. Fig. 5 is a cross sectional view on the line at w looking in the direction of the arrow b. Fig. 6 is a detailview of the slide.

Fig. 7 is a. diagrammatic View showing thebuzzer circuit. 7

The embodiment of the invention illustrated is designed for use in connection with wireless telegraphy, but it is equally as useful in connection with wireless telephony.

Referring to the drawings 1 denotes a light case within which is mounted the tuning coil 2 wound upon the paper tube 3. Fitted into adjacent corners of the case,

which is cut away at these points, are curved metallic strips 4, 4 longitudi ally slotted as at 5 through which a pair o f arms 6, 6 secured to arubber button7 project. Afriction plate 8 curved to fit the underside of the metallic strips is ,notched'to receive these two arms, at the end of one of the arms is attached a yoke 9 supporting a roller 10 which is adapted to rest upon and cooperate withthe tuning co-il.v The other arm acts as a guide for this roller, and a spring 11 located between the yoke and the friction plate holds the parts in position so that the complete structure which I will term the slide can be moved freely. along the metallic strip by means of the button. This produces a smoothly acting slide, free from any danger of cramping or sticking, and sufiiciently stifi' to stay in any position of adjustment. At one end of the casing one terminal of the coil is connected to a binding post 12 to which the aerial wireis attached. 7 'A rotary condenser 13 of usual construction, but adapted in size to'fit within the tuning coil, is mounted on one of the end plates 14 of the casing, the two parts of the condenser being electrically'connected with ends of the slide strips by the act of securing the end plate in position; a handle 15 is provided with which the movable member of the condenser can be operated.

On the opposite end plate 20 various additional parts of the receiving apparatus are mounted in such a compass that they are contained within the hollow tuning coil, this end plate being preferably made of insulating materialto provide asuitable support. Secured to the inner surface of this end plate 20 is a framework to which the various parts of the apparatus, except the main condenser, are secured. It comprises-the disk 60 secured to the end plate, posts 48,

62 and the disk 61 secured to the ends of the posts; post 62 is a ground post having con nected to it on the out-side of the end plate the binding post 32. The parts of the detector 25 are conveniently mounted on the, door 22 and hinged to the end plate- 20 to make it accessible for adjustment. The detector is connected by the wire 27 through the condenser 28 to the ground post 62.

30 denotes a switch connected through the denser 28.

In order to test the detector I have provided a tell-tale device in the nature of a buzzer, operated by a battery wlth a normally open circuit. In detail the buzzer comprises a frame struck up from a piece I screw 50 threaded in this arm engages.

of sheet n ietal having a base 41, an upstanding lug 42 to which the magnet 43 is atthis means the arm can be sprung to vary tension of the reed and consequently its vibration. This form ofbuzzer is especially well adapted for use with a wireless detector.

46 denotes a battery which may be supported by a clip attached to the post 62. An

' sulated tip35 of the switch'spindle when it exposed terminal of the battery is in elec- 5 trical contact with the post 48 which thus -20 the other side of the battery being conbecomes one terminal of the battery circuit,

nected to the magnet and thence to the spring terminal 47 normally standing away from the post 48 so as to break the circuit, but in position'to be acted upon by the inis moved longitudinally with the switch'in on position, to close the circuit and sound the buzzer. A condenser 66 is connected between-the buzzer circuit and ground.

One of the slide conducting strips 4 connects one terminal of the main condenser 13 with the switch 30 through the strip 31. The other slide strip 5 connects the other side of the condenser 13 with the-ground post 62 through the strip 31%. As a result of this construction, it will be seen that all of the o erative parts of the mechanism are inclose within the tuning coil, the rotary condenser at one end with nothing but its operating knob showing on the outside of the casing, and the detector, condenser, buzzer and circuit connections are inclosed in the other end of the coil with nothing showing except thedetector switch buttons, tele phone binding posts and the aerial and ground binding posts. The slides are'fitted in the curved slide plates, and the operating buttons conform the casing.

The apparatus is complete in all its details and constitutes a highly etficient receiving apparatus, and it is peculiarly adapted for use in small stations, on boats, aeroplanes and for other uses where lightness and compactness are necessary.

I do not wish to be understood as limiting myself to the exact structure or assembly of parts here illustratedand described, as I am aware that various modifications in assembly can utilized.

I do not wish to be understood that the circuit connections are liinitrd to those shown in the drawings.

closely to the contour of I claim as my invention:

1. In a wireless receiving apparatus a casing, a hollow tuning coil fixedly secured within the casing and open at both ends, closures for the ends of said casing and coil, a condenser mounted on one closure and'located within the coil, a detector, circuit connections and a detector switch mounted on the other closure and located within the coil, slides arranged in operative relation to the coil and. movable longitudinally thereof, supports for said slides in electrical connection therewith, said supports electrically connecting said condenser with the detector and ground terminals.

'2. 'In a wireless receiving apparatus a casing and a tuning coil located therein, a

closure for one end of said casing, a condenser supported by said closure and located within the coil, an operating handle for the condenser; a closure for the opposite end ofsaid casing, a detector mounted on the inner face of said closure, a ground terminal and a switch terminal carried by said closure, electrical connections between said terminals and the terminals of the condenser, a circuit from the ground terminals to the other switch terminal and including the detector, a switch controlling said detector circuit, an operating handle for the switch located on the front of said closure, said circuit connections and switch being supported upon said closure and located within said coil.

3. In a wireless receiving apparatus a casing, a tuning coil located therein, a closure for one end of the casing, a condenser supported by said closure and located within the coil, an operating handle for said condenser; a closure for the opposite end of said casing, a detector mounted thereon, a ground terminal mounted thereon, a switch mounted thereon, a circuit including said detector and switch, a telephone-receivercircuit, a condenser located therein, said detector circuit and telephone-receivcr-circuit bein arranged within the coil.

4. n a wireless receiving apparatus a casing, a hollow tuning coil mounted within the casing, said casing having a plurality of longitudinal openings, strips of conducting material fitting in and closing said opening and extending from one end of the case to the other, said conducting strips being longitudinally slotted,- slides arranged in 006perative relation with the coil with stems extending through said slots, operating buttons secured to said stems, an end plate to close one end of the casing and coil, a condenser carried by saidend plate and adapted to fit within the coil, condenser terminals arranged opposite to the ends of said conducting strips and adapted to make elec-- t-rical contact therewith when said end plate is fitted in .place; an end plate adapted to condenser, detector and thecircuit connec-- close the opposite end of'the casing and coil, tions being inclosed within said coil and 10 a detector mounted on the inner surface; of casing and concealed thereby.

I said end late, circuit 'connectionstherefor, ROBERT R. GOLDTHOBP.

and eircu1t terminals arranged opposite to the other endsof the conducting strips and Witnesses: adapted to ,make electrical contact. there- H. E. HART, with when the end plate is in'position, the G. J. SULLIVAN. 

